diff -r 027481f19944 -r b361e9da3c3b mercurial/exchange.py
--- a/mercurial/exchange.py	Tue May 16 12:31:07 2023 +0200
+++ b/mercurial/exchange.py	Thu May 18 17:07:43 2023 -0700
@@ -1637,7 +1637,7 @@
 
     # We allow the narrow patterns to be passed in explicitly to provide more
     # flexibility for API consumers.
-    if includepats or excludepats:
+    if includepats is not None or excludepats is not None:
         includepats = includepats or set()
         excludepats = excludepats or set()
     else: